P1107
HondaManifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage
Medium SeverityThis code indicates that the engine's computer has detected an intermittent low voltage reading from the Manifold Absolute Pressure (MAP) sensor. This malfunction can lead to incorrect fuel delivery and ignition timing, resulting in noticeable performance issues and decreased fuel economy.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely parked and turned off before attempting any repairs. Disconnect the battery's negative terminal to prevent electrical shorts or accidental engine starts during work. Allow engine components to cool down to avoid burns. If working with fuel lines, be aware of fuel pressure and potential spills.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Poor engine performance
- Reduced fuel economy
- Engine hesitation or stalling
- Difficulty starting the engine
- Black smoke from the exhaust (due to rich fuel mixture)
Common Causes
- Faulty Manifold Absolute Pressure (MAP) sensor
- Corroded or loose electrical connections at the MAP sensor
- Damaged or frayed wiring in the MAP sensor circuit
- Vacuum leaks in the intake manifold affecting sensor readings
- Contamination or blockage in the MAP sensor's vacuum port
- Issue with the Engine Control Module (ECM) (less common)
Frequently reported on: Honda Civic 2006-2011, Honda Accord 2003-2007, Honda CR-V 2002-2006, Honda Element 2003-2011, Honda Fit 2007-2013
Diagnostic Steps
- Locate the Manifold Absolute Pressure (MAP) sensor, typically mounted on the intake manifold or connected via a vacuum hose.
- Inspect the MAP sensor's electrical connector for any signs of corrosion, looseness, or damage. Clean if necessary and ensure a secure connection.
- Examine the wiring harness leading to the MAP sensor for any visible cuts, chafing, or signs of damage. Repair as needed.
- Check the vacuum hose connected to the MAP sensor (if applicable) for cracks, leaks, or blockages. Replace or clean the hose.
- If the visual inspection yields no clear faults, consider testing the MAP sensor's voltage and resistance with a multimeter according to service manual specifications.
- If tests indicate a faulty sensor, carefully remove and replace the MAP sensor with a new, high-quality OEM or equivalent part.
- After replacement, clear the P1107 code using an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If you have replaced the MAP sensor and cleared the code, but the P1107 code returns or the engine symptoms persist, it's highly advisable to consult with a professional diagnostic technician. There might be a deeper electrical issue within the wiring harness or the Engine Control Module (ECM) that requires advanced tools and expertise.
Commonly Asked Questions
What does P1107 specifically mean for a Honda vehicle?
For Honda vehicles, P1107 primarily indicates an intermittent low voltage signal from the Manifold Absolute Pressure (MAP) sensor circuit. This means the engine computer is not receiving reliable data about engine load and vacuum.
Can I drive my Honda with a P1107 code?
While you might be able to drive, it's not recommended for extended periods. The engine's performance will likely be reduced, fuel economy will suffer, and in some cases, it could lead to stalling or harder starting. It's best to address the issue promptly.
Is replacing the MAP sensor difficult for a DIY mechanic?
No, replacing the MAP sensor is generally considered an easy repair. It usually involves disconnecting an electrical connector and removing one or two bolts, then reversing the process for installation. However, proper diagnosis is crucial to ensure the sensor itself is the problem.
Do I need special tools to fix a P1107 code?
For basic diagnosis and replacement, you'll need an OBD-II scanner to read and clear the code, a basic socket/wrench set, and possibly a multimeter for advanced testing. No specialized Honda-specific tools are typically required.
What if the P1107 code returns after replacing the MAP sensor?
If the code reappears, the issue is likely not the MAP sensor itself but rather the wiring, connector, or even a vacuum leak affecting the sensor's readings. In rare cases, the Engine Control Module (ECM) could be faulty. Thoroughly re-inspect the wiring and vacuum lines, or seek professional assistance.